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<main role="main">
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<!--Weave of 'Times of Day' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7 Modules</a></li><li><a href="index.html">core</a></li><li><a href="index.html#6">Chapter 6: Nouns</a></li><li><b>Times of Day</b></li></ul></div>
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<p class="purpose">To make a built-in kind of value for times of day, such as "11:22 AM".</p>
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<ul class="toc"><li><a href="6-tod.html#SP5">§5. Parsing</a></li><li><a href="6-tod.html#SP8">§8. Parsing event rules</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>"Men can do nothing without the make-believe of a beginning. Even Science,
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the strict measurer, is obliged to start with a make-believe unit, and must fix
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on a point in the stars' unceasing journey when his sidereal clock shall pretend
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that time is at Nought. His less accurate grandmother Poetry has always been
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understood to start in the middle; but on reflection it appears that her
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proceeding is not very different from his; since Science, too, reckons backwards
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as well as forwards, divides his unit into billions, and with his clock-finger
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at Nought really sets off in medias res" (George Eliot, "Daniel Deronda").
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Our make-believe here is midnight, our unit is divided not into billions but
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into 1440, and a value of this kind holds one of two possibilities:
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</p>
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<ul class="items"><li>(i) an absolute time, measured as the number of minutes since midnight;
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</li><li>(ii) a relative time, measured in minutes.
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</li></ul>
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<p class="commentary">Thus the value 70 might mean 1:10 AM, or it might mean 70 minutes, and
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type-checking does not try to distinguish the two. This is so that arithmetic
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will be easier — we can add 70 minutes to 1:10 AM to get 2:20 AM, but if they
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had different kinds, this would be illegal.
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</p>
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<p class="commentary">The ambiguity is occasionally unhelpful, though: we have to supplement the "[a
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time]" Understand token, which parses an absolute time, with a special "[a
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time period]" one, so that users are able to parse relative times as well. And
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of course, times really do not behave like integers, no matter how we might
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pretend. What is 4:52 PM plus 3:31 PM, in any very meaningful sense? (Inform
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adds these by treating them as durations since the previous midnight in each
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case, but it's hard to see why that makes much human sense.) But despite these
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qualms, it has been a reasonably good design in practice, and few authors
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have objected.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K_time</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">PL::TimesOfDay::start</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">PL::TimesOfDay::start</span></span>:<br/>Plugins - <a href="26-pl.html#SP8">§8</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">PLUGIN_REGISTER</span><span class="plain-syntax">(</span><span class="constant-syntax">PLUGIN_NEW_BASE_KIND_NOTIFY</span><span class="plain-syntax">, </span><a href="6-tod.html#SP3" class="function-link"><span class="function-syntax">PL::TimesOfDay::times_new_base_kind_notify</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">PL::TimesOfDay::times_new_base_kind_notify</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">PL::TimesOfDay::times_new_base_kind_notify</span></span>:<br/><a href="6-tod.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">new_base</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">name</span><span class="plain-syntax">, </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::eq_wide_string</span><span class="plain-syntax">(</span><span class="identifier-syntax">name</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="string-syntax">"TIME_TY"</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">K_time</span><span class="plain-syntax"> = </span><span class="identifier-syntax">new_base</span><span class="plain-syntax">; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="function-syntax">PL::TimesOfDay::kind</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">PL::TimesOfDay::kind</span></span>:<br/>Compile Arithmetic - <a href="13-ca.html#SP1">§1</a><br/>RValues - <a href="14-rv.html#SP13">§13</a><br/>Lvalues - <a href="14-lv.html#SP15">§15</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">K_time</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. Parsing. </b>Although they are eventually stored in variables of the same kind ("time"),
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relative and absolute times are parsed differently — they really are not
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linguistically the same thing at all.
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</p>
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<pre class="Preform-displayed-code all-displayed-code code-font">
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<span class="Preform-function-syntax"><s-literal-time></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">minus</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><elapsed-time></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, Rvalues::from_time(-R[1], W) }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><elapsed-time></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, Rvalues::from_time(R[1], W) }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><clock-time></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, Rvalues::from_time(R[1], W) }</span>
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<span class="Preform-function-syntax"><elapsed-time></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><cardinal-number></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">hour/hours</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { 60*R[1], - }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><cardinal-number></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">minute/minutes</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { pass 1 }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><cardinal-number></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">hour/hours</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><cardinal-number></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">minute/minutes</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { 60*R[1]+R[2], - }</span>
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<span class="Preform-function-syntax"><clock-time></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><cardinal-number></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><am-pm></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-tod.html#SP5_1" class="named-paragraph-link"><span class="named-paragraph">Vet the time for clock range</span><span class="named-paragraph-number">5.1</span></a></span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><digital-clock-time></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><am-pm></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-tod.html#SP5_1" class="named-paragraph-link"><span class="named-paragraph">Vet the time for clock range</span><span class="named-paragraph-number">5.1</span></a></span>
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<span class="Preform-function-syntax"><am-pm></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">am</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">pm</span>
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</pre>
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<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
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<p class="commentary firstcommentary"><a id="SP5_1" class="paragraph-anchor"></a><b>§5.1. </b>Note that we allow "12:01 AM" (one minute past midnight) and "12:01 PM"
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(ditto noon), and also "0:01 AM" and "00:01 AM", but not "0:01 PM".
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Lawrence Sanders's sci-fi thriller "The Tomorrow File", if that can be
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mentioned on the same page as "Daniel Deronda", had a terrific cover of
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a digital clock glowing with "24:01" — but we won't allow that, either.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Vet the time for clock range</span><span class="named-paragraph-number">5.1</span></span><span class="Preform-comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">time_cycles</span><span class="plain-syntax"> = </span><span class="constant-syntax">12</span><span class="plain-syntax">*60*</span><span class="identifier-syntax">R</span><span class="plain-syntax">[2];</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">t</span><span class="plain-syntax"> = </span><span class="identifier-syntax">R</span><span class="plain-syntax">[1], </span><span class="identifier-syntax">time_hours</span><span class="plain-syntax">, </span><span class="identifier-syntax">time_minutes</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">R</span><span class="plain-syntax">[0] == </span><span class="constant-syntax">0</span><span class="plain-syntax">) { </span><span class="identifier-syntax">time_hours</span><span class="plain-syntax"> = </span><span class="identifier-syntax">t</span><span class="plain-syntax">; </span><span class="identifier-syntax">time_minutes</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> { </span><span class="identifier-syntax">time_hours</span><span class="plain-syntax"> = </span><span class="identifier-syntax">t</span><span class="plain-syntax">/60; </span><span class="identifier-syntax">time_minutes</span><span class="plain-syntax"> = </span><span class="identifier-syntax">t</span><span class="plain-syntax">%60; }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">time_hours</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">time_cycles</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">; </span><span class="comment-syntax"> reject for example "0:01 PM"</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">time_hours</span><span class="plain-syntax"> == </span><span class="constant-syntax">12</span><span class="plain-syntax">) </span><span class="identifier-syntax">time_hours</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="comment-syntax"> allow for example "12:01 AM"</span>
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<span class="plain-syntax"> ==> { </span><span class="identifier-syntax">time_minutes</span><span class="plain-syntax"> + </span><span class="constant-syntax">60</span><span class="plain-syntax">*</span><span class="identifier-syntax">time_hours</span><span class="plain-syntax"> + </span><span class="identifier-syntax">time_cycles</span><span class="plain-syntax">, - };</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="6-tod.html#SP5">§5</a> (twice).</li></ul>
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<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>These are times of day written in the style of a digital clock: "00:00",
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"5:21", "17:21". The syntax must be one or two digits, followed by a
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colon, followed by exactly two digits; it is permissible for the first of
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two digits to be zero; when that is discarded, the hours part must be in
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the range 0 to 23, and the minutes part in the range 0 to 59.
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</p>
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<pre class="Preform-displayed-code all-displayed-code code-font">
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<span class="Preform-function-syntax"><digital-clock-time></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">internal</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">1</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">{</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">int</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">time_minutes</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">time_hours</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">;</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">int</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">colons</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">digits</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">;</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">wchar_t</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">wd</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Lexer::word_text</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">Wordings::first_wn</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">));</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">for</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">=0; </span><span class="Preform-identifier-syntax">wd</span><span class="Preform-plain-syntax">[</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">]; </span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">++) {</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (((</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">==1) || (</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">==2)) && (</span><span class="Preform-identifier-syntax">wd</span><span class="Preform-plain-syntax">[</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">] == </span><span class="Preform-character-syntax">':'</span><span class="Preform-plain-syntax">) && (</span><span class="Preform-identifier-syntax">wd</span><span class="Preform-plain-syntax">[</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">+1])) {</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax"> >= </span><span class="Preform-constant-syntax">24</span><span class="Preform-plain-syntax">) { ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> }; }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">time_hours</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax">;</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">; </span><span class="Preform-identifier-syntax">digits</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">;</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">colons</span><span class="Preform-plain-syntax">++;</span>
|
|
<span class="Preform-plain-syntax"> } </span><span class="Preform-reserved-syntax">else</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">Characters::isdigit</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">wd</span><span class="Preform-plain-syntax">[</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">])) {</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">10</span><span class="Preform-plain-syntax">*</span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax"> + (</span><span class="Preform-identifier-syntax">wd</span><span class="Preform-plain-syntax">[</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">]-</span><span class="Preform-character-syntax">'0'</span><span class="Preform-plain-syntax">); </span><span class="Preform-identifier-syntax">digits</span><span class="Preform-plain-syntax">++;</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> ((</span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax"> >= </span><span class="Preform-constant-syntax">60</span><span class="Preform-plain-syntax">) || (</span><span class="Preform-identifier-syntax">digits</span><span class="Preform-plain-syntax"> > </span><span class="Preform-constant-syntax">2</span><span class="Preform-plain-syntax">)) { ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> }; }</span>
|
|
<span class="Preform-plain-syntax"> } </span><span class="Preform-reserved-syntax">else</span><span class="Preform-plain-syntax"> { ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> }; }</span>
|
|
<span class="Preform-plain-syntax"> }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">colons</span><span class="Preform-plain-syntax"> != </span><span class="Preform-constant-syntax">1</span><span class="Preform-plain-syntax">) { ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> }; }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">time_minutes</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax">;</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> ((</span><span class="Preform-identifier-syntax">time_hours</span><span class="Preform-plain-syntax"> < </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">) || (</span><span class="Preform-identifier-syntax">time_hours</span><span class="Preform-plain-syntax"> > </span><span class="Preform-constant-syntax">12</span><span class="Preform-plain-syntax">)) { ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> }; }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> ((</span><span class="Preform-identifier-syntax">time_minutes</span><span class="Preform-plain-syntax"> < </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">) || (</span><span class="Preform-identifier-syntax">time_minutes</span><span class="Preform-plain-syntax"> >= </span><span class="Preform-constant-syntax">60</span><span class="Preform-plain-syntax">)) { ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> }; }</span>
|
|
<span class="Preform-plain-syntax"> ==> { </span><span class="Preform-identifier-syntax">time_minutes</span><span class="Preform-plain-syntax"> + </span><span class="Preform-identifier-syntax">time_hours</span><span class="Preform-plain-syntax">*60, - };</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">return</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">TRUE</span><span class="Preform-plain-syntax">;</span>
|
|
<span class="Preform-plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b>And these are the Continental equivalent, with an "h" instead of
|
|
the colon: thus "16h15" for quarter past four in the afternoon. (The
|
|
standard English grammar doesn't use this, but translators might want to.)
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><continental-clock-time></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">internal</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">1</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">{</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">int</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">time_minutes</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">time_hours</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">;</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">int</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">colons</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">digits</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">;</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">wchar_t</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">wd</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Lexer::word_text</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">Wordings::first_wn</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">));</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">for</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">=0; </span><span class="Preform-identifier-syntax">wd</span><span class="Preform-plain-syntax">[</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">]; </span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">++) {</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (((</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">==1) || (</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">==2)) && (</span><span class="Preform-identifier-syntax">wd</span><span class="Preform-plain-syntax">[</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">] == </span><span class="Preform-character-syntax">'h'</span><span class="Preform-plain-syntax">) && (</span><span class="Preform-identifier-syntax">wd</span><span class="Preform-plain-syntax">[</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">+1])) {</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax"> >= </span><span class="Preform-constant-syntax">24</span><span class="Preform-plain-syntax">) { ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> }; }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">time_hours</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax">;</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">; </span><span class="Preform-identifier-syntax">digits</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">;</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">colons</span><span class="Preform-plain-syntax">++;</span>
|
|
<span class="Preform-plain-syntax"> } </span><span class="Preform-reserved-syntax">else</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">Characters::isdigit</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">wd</span><span class="Preform-plain-syntax">[</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">])) {</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">10</span><span class="Preform-plain-syntax">*</span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax"> + (</span><span class="Preform-identifier-syntax">wd</span><span class="Preform-plain-syntax">[</span><span class="Preform-identifier-syntax">t</span><span class="Preform-plain-syntax">]-</span><span class="Preform-character-syntax">'0'</span><span class="Preform-plain-syntax">); </span><span class="Preform-identifier-syntax">digits</span><span class="Preform-plain-syntax">++;</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> ((</span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax"> >= </span><span class="Preform-constant-syntax">60</span><span class="Preform-plain-syntax">) || (</span><span class="Preform-identifier-syntax">digits</span><span class="Preform-plain-syntax"> > </span><span class="Preform-constant-syntax">2</span><span class="Preform-plain-syntax">)) { ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> }; }</span>
|
|
<span class="Preform-plain-syntax"> } </span><span class="Preform-reserved-syntax">else</span><span class="Preform-plain-syntax"> { ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> }; }</span>
|
|
<span class="Preform-plain-syntax"> }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">colons</span><span class="Preform-plain-syntax"> != </span><span class="Preform-constant-syntax">1</span><span class="Preform-plain-syntax">) { ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> }; }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">time_minutes</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">ratchet</span><span class="Preform-plain-syntax">;</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> ((</span><span class="Preform-identifier-syntax">time_hours</span><span class="Preform-plain-syntax"> < </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">) || (</span><span class="Preform-identifier-syntax">time_hours</span><span class="Preform-plain-syntax"> > </span><span class="Preform-constant-syntax">12</span><span class="Preform-plain-syntax">)) { ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> }; }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> ((</span><span class="Preform-identifier-syntax">time_minutes</span><span class="Preform-plain-syntax"> < </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">) || (</span><span class="Preform-identifier-syntax">time_minutes</span><span class="Preform-plain-syntax"> >= </span><span class="Preform-constant-syntax">60</span><span class="Preform-plain-syntax">)) { ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> }; }</span>
|
|
<span class="Preform-plain-syntax"> ==> { </span><span class="Preform-identifier-syntax">time_minutes</span><span class="Preform-plain-syntax"> + </span><span class="Preform-identifier-syntax">time_hours</span><span class="Preform-plain-syntax">*60, - };</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">return</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">TRUE</span><span class="Preform-plain-syntax">;</span>
|
|
<span class="Preform-plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. Parsing event rules. </b>The following is used to parse the preamble to rules which take place at
|
|
a specific time of day, or when a named event occurs.
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><event-rule-preamble></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">at</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><clock-time></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { pass 1 }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">at</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">the</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">time</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">when</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { NO_FIXED_TIME, - }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">at</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">the</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">time</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">that</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-tod.html#SP8_1" class="named-paragraph-link"><span class="named-paragraph">Issue PM_AtTimeThat problem</span><span class="named-paragraph-number">8.1</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">at</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-tod.html#SP8_2" class="named-paragraph-link"><span class="named-paragraph">Issue PM_AtWithoutTime problem</span><span class="named-paragraph-number">8.2</span></a></span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP8_1" class="paragraph-anchor"></a><b>§8.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Issue PM_AtTimeThat problem</span><span class="named-paragraph-number">8.1</span></span><span class="Preform-comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_AtTimeThat</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"this seems to use 'that' where it should use 'when'"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"assuming it's trying to apply a rule to an event. (The convention is "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that any rule beginning 'At' is a timed one. The time can either be a "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"fixed time, as in 'At 11:10 AM: ...', or the time when some named "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"event takes place, as in 'At the time when the clock chimes: ...'.)"</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="6-tod.html#SP8">§8</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP8_2" class="paragraph-anchor"></a><b>§8.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Issue PM_AtWithoutTime problem</span><span class="named-paragraph-number">8.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_AtWithoutTime</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"'at' what time? No description of a time is given"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"which means that this rule can never have effect. (The convention is "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"that any rule beginning 'At' is a timed one. The time can either be a "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"fixed time, as in 'At 11:10 AM: ...', or the time when some named "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"event takes place, as in 'At the time when the clock chimes: ...'.)"</span><span class="plain-syntax">);</span>
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</pre>
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